My iPhone 6 plus had so many problems, is it common?

I ttok my phone 5 times to apple to get it fixed, the screen goes crazy with lines on top of it, and i cant tipe... it just happen from time to time so i went twice to apple store and they didnt see it so they didint fixed, thisr time they saw the problem and changed the screen onle so a week lated the problem came back, then the forth time they change the phone, when i got home the camera didnt work ( on a new phone??? ) then now the screen is crazy again... so i will be back to the apple store this wednesday for the 6th time..... wow,,,is it just me??

I ttok my phone 5 times to apple to get it fixed, the screen goes crazy with lines on top of it, and i cant tipe... it just happen from time to time so i went twice to apple store and they didnt see it so they didint fixed, thisr time they saw the problem and changed the screen onle so a week lated the problem came back, then the forth time they change the phone, when i got home the camera didnt work ( on a new phone??? ) then now the screen is crazy again... so i will be back to the apple store this wednesday for the 6th time..... wow,,,is it just me??